EN 12953-4:2002

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Großwasserraumkessel - Teil 4: Verarbeitung und Bauausführung für drucktragende KesselteileChaudieres a tubes de fumée - Partie 4: Fabrication et construction des parties sous pression des chaudieresShell boilers - Part 4: Workmanship and construction of pressure parts of the boiler27.060.30Grelniki vode in prenosniki toploteBoilers and heat exchangersICS:Ta slovenski standard je istoveten z:EN 12953-4:2002SIST EN 12953-4:2002en01-november-2002SIST EN 12953-4:2002SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12953-4May 2002ICS 27.060.30; 27.100English versionShell boilers - Part 4: Workmanship and construction of pressureparts of the boilerChaudières à tubes de fumée - Partie 4: Fabrication etconstruction des parties sous pression des chaudièresGroßwasserraumkessel - Teil 4: Verarbeitung undBauausführung für drucktragende KesselteileThis European Standard was approved by CEN on 15 May 2002.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2002 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12953-4:2002 ESIST EN 12953-4:2002

Typical examples of acceptable weld details.21Annex ZA (informative)
Clauses of this European Standard addressing essential requirements or otherprovisions of EU Directives.43Bibliography.44SIST EN 12953-4:2002

e < 62,56
e < 93,09
ee/3A conservative method of measurement (covering peaking and ovality) shall be by means of a 20°profile gauge or template.The use of such a profile gauge shall be in accordance with Figure 5.3-1. Two readings shall betaken, P1 and P2, on each side of the seam at any particular location, the peaking is taken as beingequivalent to 0,25 (P1+P2), or P3.SIST EN 12953-4:2002

deviationsmmdiInternal diameter+ 5, - 20ePlate thickness±
2LcorTotal length of corrugation± 25PcorPitch of corrugation±
5hHeight of corrugation± 10See Figure 5.9-1Keydi internal diametere plate thicknessh height of corrugationsLcor total length of corrugationsPcor pitch of corrugationsFigure 5.9-1 — Corrugated furnaces5.9.4The longitudinal welds of furnaces shall be placed in such a position that they can be examined from thewater side in accordance with inspection category 2 of EN 12953-3.5.9.5Corrugated furnaces and bowling hoops shall be produced by machine. They shall be normalised unlessthe manufacturing process is carried out above the normalising temperature.5.9.6If stiffeners are required, they shall be attached externally by continuous full penetration welds.SIST EN 12953-4:2002

15°, including the width of the weld ifso desired.5.13 Openings in or adjacent to weldsOpenings in or adjacent to welded seams shall be avoided, especially if the seams are not stress relieved. Theminimum distance from the centreline of the welded seam to the nearest point of the weld of the connection, oredge of the opening, shall be 60 mm, or four times the shell plate thickness, whichever is the larger.NOTEIf this is not possible, it is recommended that the opening seam should cross the welded seam completely and sothat the tangent at the point where the axis of the seam meets the edge of the opening is this axis as close as possible to 90.Crossing welded seams shall be non-destructively examined for a length of 60 mm, or four times the shell platethickness, whichever is the larger, on each side of the opening.5.14 Fillet WeldsFillet welds may be employed as strength welds for pressure parts provided the limitations as given in annex Ashall be observed. In order to ensure complete fusion at the root of the fillet welds, particular care shall be taken inthe layout of joints with fillet welds.5.15 Fabrication5.15.1 GeneralThe weld quality shall be in accordance with the requirements of this standard. The methods of welding mainseams shall provide full penetration and it shall be demonstrated by welding procedure tests that the weldingmethod can produce a weld that is free from defects.The manufacturer shall include the preheating temperature in the welding procedure. The preheating temperatureshall be determined by taking into consideration the composition and thickness of the metal being welded, the typeof joint, the consumable being used and the heat input involved. General recommendations for preheat
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